linux-kernel - Re: [PATCH v2] libbpf: Fix NULL pointer dereference in bpf_object__collect_prog

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Date: Thu, 21 Dec 2023 05:00:24 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Xin Liu <liuxin350@...wei.com>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 martin.lau@...ux.dev, song@...nel.org, yhs@...com, john.fastabend@...il.com,
 kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org, yanan@...wei.com,
 wuchangye@...wei.com, xiesongyang@...wei.com, kongweibin2@...wei.com,
 tianmuyang@...wei.com, zhangmingyi5@...wei.com
Subject: Re: [PATCH v2] libbpf: Fix NULL pointer dereference in
 bpf_object__collect_prog_relos

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@...nel.org>:

On Thu, 21 Dec 2023 11:39:47 +0800 you wrote:
> From: Mingyi Zhang <zhangmingyi5@...wei.com>
> 
> An issue occurred while reading an ELF file in libbpf.c during fuzzing:
> 
> 	Program received signal SIGSEGV, Segmentation fault.
> 	0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206
> 	4206 in libbpf.c
> 	(gdb) bt
> 	#0 0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206
> 	#1 0x000000000094f9d6 in bpf_object.collect_relos () at libbpf.c:6706
> 	#2 0x000000000092bef3 in bpf_object_open () at libbpf.c:7437
> 	#3 0x000000000092c046 in bpf_object.open_mem () at libbpf.c:7497
> 	#4 0x0000000000924afa in LLVMFuzzerTestOneInput () at fuzz/bpf-object-fuzzer.c:16
> 	#5 0x000000000060be11 in testblitz_engine::fuzzer::Fuzzer::run_one ()
> 	#6 0x000000000087ad92 in tracing::span::Span::in_scope ()
> 	#7 0x00000000006078aa in testblitz_engine::fuzzer::util::walkdir ()
> 	#8 0x00000000005f3217 in testblitz_engine::entrypoint::main::{{closure}} ()
> 	#9 0x00000000005f2601 in main ()
> 	(gdb)
> 
> [...]

Here is the summary with links:
  - [v2] libbpf: Fix NULL pointer dereference in bpf_object__collect_prog_relos
    https://git.kernel.org/bpf/bpf-next/c/929154ac3b88

You are awesome, thank you!
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